I’ve mentioned this before but I have found the Schaffner line filters to be
effective for many types of RFI where you can identify the source and prevent
the AC supply line from becoming an antenna. Works for variable drives etc. The
actual radiated power is low and if the RF is contained in the device,
preferably grounded, it’s usually not an issue. That’s why a line filter,
connected as closely as possible to the input (or output of a generator) is
very effective.
73,
Jim K4QPL
Sent from my iPhone
> On Jul 16, 2022, at 3:57 AM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
> On page 23 of this link is a filter that I designed and W6GJB built for our
> HF county expeditions for 7QP and CQP. It's designed to be effective from 80M
> to 10M. It was added to the ARRL Handbook several years ago.
>
> http://k9yc.com/RFI-Ham.pdf
>
> For 6M and above, I suggest following the recommendations for transmitting
> chokes wound with RG8-size power cables.
>
> http://k9yc.com/ChokesVHF.pdf
>
> 73, Jim K9YC
>
>> On 7/15/2022 10:29 PM, Mike Fatchett W0MU wrote:
>> I purchased a small quiet off brand 1900 watt continuous generator with eco
>> mode. It generates a lot of rfi. I used it at a POTA activation last
>> weekend and it was tolerable by moving the antenna as far away from the
>> generator as possible. Putting it under heavier load did not seem to make
>> any difference nor did decreasing the load.
>> There is a ground lug on the unit but the forest service frowns on people
>> pounding in ground rods. Is there a more portable solution for a ground. I
>> have my doubts that it would change anything. I should try hooking it up
>> here at home and find out.
>> WEN 56235i Super Quiet 2350-Watt Portable Inverter Generator with Fuel Shut
>> Off, CARB Compliant, Ultra Lightweight, Black
>> I did have some big clamp ons and I put them on the extension cord and that
>> seemed to help some. I could only get 2 to 3 turns through the clamp ons
>> and I had two. Maybe I need far more turns? I did not the cabling handy to
>> hookup directly to the car battery to see if the extension cord was the
>> radiator or if it was all coming out of the generator.
>> Has anyone had any luck quieting them down?
>> W0MU
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>> http://lists.contesting.com/mailman/listinfo/rfi
>
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